ASF GitHub Bot commented on CLOUDSTACK-10232:

syed commented on a change in pull request #2465: CLOUDSTACK-10232: SystemVMs 
and VR to run as HVM on XenServer
URL: https://github.com/apache/cloudstack/pull/2465#discussion_r170059191

 File path: 
 @@ -1368,12 +1368,23 @@ public VM createVmFromTemplate(final Connection conn, 
final VirtualMachineTO vmS
         final String bootArgs = vmSpec.getBootArgs();
         if (bootArgs != null && bootArgs.length() > 0) {
+            // send boot args for PV instances
             String pvargs = vm.getPVArgs(conn);
             pvargs = pvargs + vmSpec.getBootArgs().replaceAll(" ", "%");
             if (s_logger.isDebugEnabled()) {
                 s_logger.debug("PV args are " + pvargs);
             vm.setPVArgs(conn, pvargs);
+            // send boot args into xenstore-data for HVM instances
+            Map<String, String> xenstoreData = new HashMap<>();
+            xenstoreData.put("vm-data/cloudstack/init", bootArgs);
 Review comment:
   Could you please move the `vm-data/cloudstack/init` string into a class 

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> SystemVMs and VR to run as HVM on XenServer
> -------------------------------------------
>                 Key: CLOUDSTACK-10232
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10232
>             Project: CloudStack
>          Issue Type: New Feature
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>          Components: SystemVM, Virtual Router, XenServer
>    Affects Versions:,
>            Reporter: Pierre-Luc Dion
>            Priority: Major
> Following the recent Meltdown-Spectre security risk,one of the mitigation,as 
> of Jan 2018, for XenServer Hypervisor is to run Virtual-Machine in HVM mode.
> Currently SystemVMs and Virtual-Routers run as PV on XenServer and the eth0 
> is configured using {{/etc/init.d/cloud-early-config}} using grub params from 
> {{/proc/cmdline}}. When VM run as HVM, it is not possible to push initial 
> boot instruction via pygrub.
> Quick tests has been done using xenstore and it look like it would be 
> possible to send same initial boot instruction has pygrub but using xenstore 
> for HVM instances.

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